/*
 * 版权所有 (C) 2015 知启蒙(ZHIQIM) 保留所有权利。[遇见知启蒙，邂逅框架梦，本文采用木兰宽松许可证第2版]
 * 
 * https://zhiqim.org/project/zhiqim_components/zhiqim_upload_large.htm
 *
 * Zhiqim UploadLarge is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
package org.zhiqim.uploadlarge.action;

import org.zhiqim.httpd.HttpRequest;
import org.zhiqim.httpd.context.core.Action;
import org.zhiqim.kernel.util.Files;
import org.zhiqim.kernel.util.Validates;
import org.zhiqim.orm.ORM;
import org.zhiqim.orm.dbo.Selector;
import org.zhiqim.uploadlarge.Zuls;
import org.zhiqim.uploadlarge.dbo.UpllFile;

/**
 * 删除文件功能
 *
 * @version v1.0.0 @author zouzhigang 2014-3-21 新建与整理
 */
public class FileDeleteAction implements Action
{
    public void execute(HttpRequest request) throws Exception
    {
        String fileId = request.getParameter("fileId");
        if (Validates.isEmpty(fileId))
        {
            request.returnHistory("请选择一个有效的数据");
            return;
        }
        
        UpllFile file = ORM.table().item(UpllFile.class, fileId);
        if (file == null)
        {
            request.returnHistory("请选择一个有效的数据[fileId:"+fileId+"]");
            return;
        }
        
        ORM.table().delete(UpllFile.class, fileId);
        
        //当文件MD5只有一条记录时，同时删除文件
        Selector selector = new Selector("fileMd5", file.getFileMd5());
        if (ORM.table().count(UpllFile.class, selector) <= 1)
        {
            Files.deleteFile(Zuls.getFilePath(request, file));
        }
    }
}
